public JsonResult AsyncPic()
        {
            IEnumerable <Files> files = FilesService.instance().GetFilesByCompanyID(UserDateTicket.Company.ID);

            files = files.Where(m => m.RelationID == UserDateTicket.wx_config.ID);
            foreach (var item in files)
            {
                if (string.IsNullOrEmpty(item.media_id))
                {
                    string media_id = Utils.GetJsonValue(WXApi.Material_add_img(GetToken(), item.FilePath), "media_id");
                    item.media_id = media_id;
                    FilesService.instance().Update(item);
                }
            }
            return(Json("ok", JsonRequestBehavior.AllowGet));
        }